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1. For the data of Exercise 4.4, calculate the vari- ance using the formula
(a) of form (4.2.1);
(b) in Theorem 4.1.
2. The tar contents of 8 brands of cigarettes selected at random from the latest list released by the Federal Trade Commission are as follows: 7.3, 8.6, 10.4, 16.1, 12.2, 15.1, 14.5, and 9.3 milligrams. Calculate
(a) the mean;
(b) the variance.
3. The grade-point averages of 20 college seniors se- lected at random from a graduating class are as follows:
For the given phosphate data, ?nd
(b) the median;
(c) the mode.
The following data represent scores of 50 students in the applied business statistics test. Prepare the frequency distribution table and the frequency histogram for this data set.
suppose a fast food restaurant wishes to estimate average sales volume for a new menu item. the restaurant has analyzed
if 5 percent of automobiles in oakland county have one burned-out headlight what is the probability that in a sample of
A local TV network wants to run an informal survey of individuals who exit from a local voting station to ascertain early results on a proposal to raise funds to move the city-owned historical museum to a new location. How might the network sampl..
weakly earnings on a certain import venture are approximately normally distributed with a known mean of 219 and unknown
A survey conducted by the American Automobile Association showed that the family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls results in a sample mean of $252...
the population mean for verbal iq scores is 100 with a standard deviation of 15. suppose a researcher takes 50 random
a screw jack carries a 5 kn load. it has an m50 times 4 mm thread with a mean diameter of 47.4 mm. calculate the screw
Do the health benefits of alcohol consumption depend on the type of alcohol and the amount consumed? The Harvard School of Public Health reviewed studies investigating the relation between alcohol consumption and health.
Make use of Excel to determine the right-tail p-value.
When 319 college students are arbitarily selected and surveyed, it is observed that 120 own a car. Determine a 99% confidence interval for true proportion of all college students who own a car.
Determine a 95% confidence interval for the difference in the mean reductions in blood pressure, assuming that the measurements are normally distributed with equal variances.
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